Schönsee was formerly part of the German Empire. In the German Empire, the place was called Schönsee, Kr. Wirsitz.
The place is now called Jeziorki Kosztowskie and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schönsee | German Empire | Wirsitz | before the Versailles Treaty |
| Jeziorki Kosztowskie | Poland | Wyrzysk | after the Versailles Treaty |
| Schönsee, Kr. Wirsitz | German Empire | Wirsitz | 1939 |
| Jeziorki Kosztowskie | Poland | Wyrzysk | 1945 |
| Jeziorki Kosztowskie | Poland | Piła | 1992 |